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Structure and interactive properties of highly fluorinated phospholipid bilayers
T J McIntosh1, S A Simon, P Vierling
1Department of Cell Biology, Duke University Medical Center, Durham, North Carolina 27710, USA. tom_mcintosh@cellbio.duke.edu
Biophysical Journal
|October 1, 1996
Summary
Fluoroalkylated phospholipids form liposomes with unique structural and binding properties, differing significantly from conventional lipid bilayers. These findings are crucial for developing advanced in vivo drug delivery systems.
Area of Science:
- Biophysics
- Materials Science
- Drug Delivery
Background:
- Liposomes are essential for in vivo drug delivery.
- Fluoroalkylated phospholipids offer unique properties for liposome formulation.
Purpose of the Study:
- Investigate the structure and interactive properties of fluoroalkylated glycerophosphocholines (PCs).
- Understand how fluorination affects bilayer characteristics and binding properties for potential drug carriers.
Main Methods:
- X-ray diffraction and osmotic stress measurements to analyze bilayer structure.
- Dipole potential and hydrophobic ion binding assays to assess membrane surface properties.
Main Results:
- Electron density profiles revealed fluorine atom localization and systematic variations based on fluorination degree and phase.
- Fluoroalkylated PCs exhibited increased inter-alkyl chain distance compared to hydrocarbon PCs.
- Dipole potentials were significantly altered by fluorination, impacting hydrophobic anion binding.
Conclusions:
- Fluoroalkylated phospholipids form liposomes with distinct structural and electrostatic properties.
- These modifications influence membrane interactions and may enhance drug carrier performance.
- The altered binding properties are relevant for optimizing liposomes in vivo.